One upstream & three downstream USB (Universal Serial Bus) ports Supports both full-duplex & half-duplex operations Complies with USB (Universal Serial Bus) 2.0 & 1.1 specifications Supports auto connection & speed detection Supports plug-n-play installation & hot plugging capability Supports bus-powered & self-powered modes Compatible with Microsoft Windows 2000 2003 XP Vista 7 & Mac OS 10.3 10.4 10.5 or above